fog drop

fog drop

[′fäg ‚dräp]
(meteorology)
An elementary particle of fog, physically the same as a cloud drop. Also known as fog droplet.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Recently, many studies revealed that when severe fog formed, it usually showed obvious explosive features, including sudden surge of fog drop number density, obvious increase in the fog drop scale and water content, sharp plunge of visibility from several hundred meters to below 50 meters, and fast changing from heavy fog to severe fog within a very short time period (about 30 min) [23].
Meanwhile, the motorway police have also advised people to avoid unnecessary traveling on the motorways and highways particularly at night as dense fog drops down the visibility level to 20-30 meter only.